Exhalation vents in masks can reduce moisture buildup but also potentially spread infectious droplets. But the fix is easy. Grab some tape.
There’s a certain kind of N95 mask that’s actually bad to wear for public health during the coronavirus pandemic.
The warning is in the San Francisco health order, which says that any mask with a one-way valve — designed to facilitate easy exhaling — “allows droplets to be released from the mask, putting others nearby at risk.” said — but the vents allow unfiltered exhaled air to escape. That defeats the point of wearing a mask, which is to keep potentially infectious oral droplets from spraying outward to other people.
France Dernières Nouvelles, France Actualités
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